Screen



(No Model.)

G. W. GROSS.

SCREEN. No. 529,605. Patented Nov. 20, 1894.

WITNESSES: INVENTOH A TTORNEYS.

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- therein by upsetting or otherwise treating one UNTTED STATES PATENT Grates.

GEORGE W. cnoss, on PITTSTON, PENNSYLVANIA.

,SCREEN.

SPECIFICATION forming part of Letters Patent No. 529,605, dated November 20, 1894.

Application filed May 7, 1894. Serial No. 510,3 l0. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE W. Onoss, of Pittston, in the county'of Luzerne and State of Pennsylvania, have invented. a new and useful Improvement in Screens, of which the following is a full, clear, and exact description.

My invention relates to an improvementin screens, or screen segments, and it has for its object to provide a means whereby the screening surface of a screen may be provided with ribs formed integrally therewith, or formed of the faces, the said ribs being so produced that the screen surface or segments may be smoothly and evenly laid upon the spiders or framing of the screen, and whereby also the ribs may be made to abut against said spiders.

A further object of the invention is to so form the ribs and the screen segments that the ribs may be given more or less of a pitch, as occasion may demand, without interfering with the perfect laying of the ends of the segment upon the spiders:

The invention consists'in the novel construc-' tion and combination of the several parts, as will be hereinafter fully set forth and pointed out in the claim.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar figures and letters of reference indicate corresponding parts in all the views.

Figure 1 is a sectional view taken directly through the complete screen. Fig. 2 is a perspective view of a portion of the screen segment viewed from the inner side, and a portion of the spider to which the segment is attached. Fig. 3 is a transverse section through a portion of the screen, taken essentially on the line 3-3 of Fig.1, illustrating the perfectly fiat manner in which the segment may be attached to a spider; and Fig. 4 is an outer face view of a portion of a screensegment.

The sections A or screening surface of a screen, are made of any desired material, metal for example, and the said segments are provided with ribs 10, extending substantially from end to end, but terminating a predetermined distance from the end margins of smooth and without ribs.

the segments. These ribs may be given dif- .ferent formations, as Mr example they may be more or less curved,'or as shown in the drawings they may be more or less angular, and preferably the ribs are projected from the inner or working surfaces of the segments. The metal, if metal plates are employed for the segments, is provided with a proper number of apertures 11, more or less closely grouped, through whichvthe screenings are adapted to escape, and each segment is provided with a margin a, which is without apertnres, the ribs extending over a portion of this margin; but at the end of each rib, at

each end of a segment, a recess 12, is pro-' with recesses 12, the tongues being opposite the plain surfaces of the screen segments; and as heretofore stated, the recesses are oppositethe ends of the ribs.

The spiders B may be of any approved construction, and in placing the segments upon the spiders of the screen frame the ends of th ribs are made to abut against the inner edihes of the spiders as illustrated in Fig. 2; and preferably the apices of the ribs, when they are angular as illustrated, are placed flush, or practically so, with the inner faces of the spiders in order that there shall be no abrupt edges or projections at these points. -In placing the screen segments in this manner, the tongues'13 are brought in smooth engagement withthe outer faces of the spiders, as shown in Figs. 2 and 3, and the attachment of the segments to the spiders is elfected by passinggbolts 14 through openings 15 produced in the tongues and through the spiders, as is clearly shown in Fig. 3. It is evident that under this construction, no matter to what extent the screen may be ribbed, or how undulating the working surface may be rendered, the margins of the screen segments equivalent framing as though the working surfaces of the segments were perfectly Furthermore it is evident that the degree to which the ribs shall rise may be regulated, since no matter produced upon one of its perforated faces,

the ribs being made to abut against the inner 15 faces of the spiders, the end margins of the segment being carried over the outer face of the spiders and attached thereto, the said margi nal surface being provided with recesses opposite the ends of the ribs, as and for the 20 purpose set forth.

GEORGE W. CROSS.

Witnesses:

W. M. BERRY, J. 0. SMITH. 

